How do I get the Principals as well as the Permissions from Policy?

Question

I know how to get the permissions from a Policy:
  MyPolicy.getPermissions()
How do i get the Principals and Permissions?
If I have:
grant MyPrincipalClass "Jeff" {
   permission MyPerm "doIt"
how do I then (in my code) get both the permission and the Principal?
I am currently doing this:
java.security.PermissionCollection pc = pol.getPermissions(new java.security.CodeSource(new java.net.URL("file:/D:/JAAS/"), null));
for (java.util.Enumeration en = pc.elements(); en.hasMoreElements(); )
                System.out.println(en.nextElement());
}

Answer 1

In reference to your earlier question about "setting the Principal"; those responders pointed you to the JAAS documentation, and that's the answer here, too. You need to implement a Policy class that uses the JAAS Subject as a parameter to the Policy constructor as well as to the getPermissions() method. The Subject contains the Principals that have been added to it by (your) involved LoginModules. I'm still using JAAS 1.0 on JDK 1.3, and am real not familiar yet with the JDK 1.4 version of Security, but; I think the same applies there. Keep in mind; the "grant" only declares the permissions for a Principal; it's up to the LoginModules to establish the identity (identities) of the authenticated Principal(s) to which those permissions are to be granted.